Q. No.Identify the incorrect statement regarding the ecological impact of DDT:
1.
It is a persistent organic pollutant.
2.
As it is lipophilic, it bioaccumulates especially in predatory birds.
3.
It can be metabolized to non-toxic forms by human beings.
4.
It causes eggshell thinning in predatory birds.
To be regarded as a sanitary landfill site, all the following conditions must be fulfilled except:
1. Full or partial hydrogeological isolation
2. Refuge should be kept in an open-burning dump
3. Permanent control
4. Planned waste emplacement and covering
Polyblend is:
| 1. | environment-friendly way of disposing of solid wastes |
| 2. | replacement of CFCs in the refrigeration industry |
| 3. | an innovative way of sealing the radioactive wastes |
| 4. | a product that has the potential to effectively deal with plastic wastes |
The accidental leakage of radioactive wastes occurred in the “Three Mile Island” and “Chernobyl” respectively in:
| 1. | 1979 and 1986 | 2. | 1981 and 1988 |
| 3. | 1985 and 1991 | 4. | 1987 and 1999 |
The environmental effects of global warming include all the following except:
| 1. | Arctic sea ice decline, sea level rise, retreat of glaciers |
| 2. | Extreme weather, extreme events, tropical cyclones |
| 3. | Ocean oxygenation and increased alkalinity of ocean waters |
| 4. | Runaway and abrupt climate change |
The common misconceptions regarding ozone depletion include:
| I. | Since CFC molecules are heavier than air (nitrogen or oxygen), the CFC molecules cannot reach the stratosphere in a significant amount. |
| II. | Natural sources of tropospheric chlorine are four to five times larger than man-made ones and are responsible for ozone depletion. |
| III. | The ozone hole should be above the sources of CFCs. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
The levels of carbon dioxide is consistently increasing over the last 100+ years mainly because:
| 1. | increased respiration by increasing the human population. |
| 2. | increased worldwide standing crop. |
| 3. | an increase in the amount of infrared radiation absorbed by the atmosphere. |
| 4. | the burning of larger amounts of wood and fossil fuels. |
The thawing of permafrost in many areas of the tundra biome as a result of global warming is of concern mainly because:
| 1. | it will decrease the abundance and diversity of soil-dwelling organisms in tundra habitats. |
| 2. | the bacterial decomposition of the thawed organic materials will produce large quantities of CO2, increasing global warming. |
| 3. | Oil and coal deposits will rise to the surface |
| 4. | migration of the human population will occur towards the tropics. |
The addition of fertilizers is frequently required in agricultural lands but not in wild mainly because:
| 1. | nitrogen-fixing bacteria and detrivores are less potent in agricultural lands. |
| 2. | the nutrients that enter the plants are not returned to the soil on lands where they are harvested. |
| 3. | the agricultural lands are selected for their oligotrophic soils. |
| 4. | cultivation of agricultural lands inhibits the decomposition of organic matter. |
What is most likely to occur due to continued global warming?
| 1. | Poleward movement of plant communities |
| 2. | A fall in the sea levels |
| 3. | Increased decomposition of organic matter in the polar region |
| 4. | Increase in tundra regions |
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